Adding machine



June 22, 1954 s. w. HOPKINS ETAL 2,681,766

ADDING MACHINE Original Filed Nov. '7, 1949 13 Sheets-Sheet l (0 0 O 6' Q Q n n!) Q .n to a, Q

o I I "L a? W 1 2 0 0 \RPF Q m u-- o 0 0 H N .zku-h I 0 0 [0 N l 2 I w 4 w 3 1" N 0 v 1 HEJEIEIE gals Lu-l2 m" L=L INVENTORS. Gsonee W. HoPKmr DONALD L. RoLPH June 22, 1954 G. w. HOPKINS ET AL ADDING MACHINE l3 Sheets-Sheet 2 Original Filed Nov. '7, 1949 June 22, 1954 e. w. HOPKINS\ETAL ADDING MACHINE 13 Sheets-Sheet 3 Original Filed Nov. 7, 1949 mu mnHn lni l mmvroxs.

Geonqe W. Homru DONALD L.Rou=u- June 22, 1954 G. w. HOPKINS ET AL ADDING MACHINE l3 Sheets-Sheet 4 Original Filed NOV. 7, 1949 35 mmvroxs.

GEORGE W. Hommu DONALD L. Roum June 1954 G. w. HOPKINS ETAL 2,681,766

ADDING MACHINE Original Filed Nov. 7, 1949 13 Shets-Sheet 5 E INVENTORS.

Geonqe W. HOPKlNJ DONALD L. Roma June 22, 1954 G. w. HOPKINS ET AL ADDING MACHINE l3 Sheets-Sheet 6 Original Filed Nov. 7, 1949 INVENTORS. Geoaaz- W. Homuur Donna LRoLPu ADDING MACHINE l5 Sheets-Sheet 7 Original Filed Nov. '7, 1949 .wvszvrozzs. .Geonae- W. HOPKIN/ DONALD L ROLPH June 22, 1954 e. w. HOPKINS ETAL 2,681,755

ADDING MACHINE Original Filed Nov. 7, 1949 13 Sheets-Sheet 8 FIIELQE IN VEN T 0R8.

Graeme W. HOPKINJ DONALD L. RoLPH June 22, 1954 G. W. HOPKINS ET ADDING MACHINE l3 Sheets-Sheet 9 Original Filed Nov. 7. 1949 INVENTORS. GEORGE W. HOPKINJ' DONALD L. RoLPu June 22, 1954 G. w. HOPKINS ET AL 2,681,765

ADDING MACHINE Original Filed Nov. '7, 1949 13 Sheets-Sheet 1C JNVENTORS. Geoace W. Hommu Donna L. RoLPH June 22, 1954 G. w. HOPKINS ET AL ADDING MACHINE l3 Sheets-Sheet 11 Original Filed Nov. 7, 1949 uvvszvroas. .Geoaae W. HOPKINJ DONALD L. RoLPH June 22, 1954 s. w. HOPKINS ETAI: 2,631,765

ADDING MACHINE Original Filed Nov. 7. 1949 1s Sheets-Sheet 12 INVENTORS. Geoaqr- W. HOPKINJ' DONALD LRoum June 22, 1954 a. w. HOPKINS ET AL 2,631,766

ADDING MACHINE Original Filed Nov. '7, 1949 15 Sheets-Sheet 13 P w "\VWWWY' q eta FIE .4 mmvmas.

Geonaz Hommr DONALO LRoLPn Patented June 22, 1954 ADDING MACHINE George W. Hopkins and Donald L. Ralph, San Leandro, Caliii, assignors to Friden Calculating Machine (70., Inc., a corporation of California Original application November 7, 1949, Serial No. 125,872. Divided and this application January 31, 1950, Serial No. 141,507

' This invention relates to a registering mechanism for a ten key calculating machine and is a division of the co-pending application of the two applicants herein and Arthur J. Malavazos,

9 Claims. (01. 235-79) lateral juxtaposition to one another. In this form totals are accumulated in interior gearing of the machine during digitation, and are then 7 sensed by a sensing mechanism which actuates filed November '7, 1949, Serial No. 125,872, which the'register dials. has been abandoned in favor of the continua These and other objects of the present invention-in-part application S. N. 189,842, filed Octo- ,tion will be disclosed in the specification and ber 12, 1950, and is related to the co-pending apclaims which follow: plication S. N. M1508 of George W. Hopkins, one Throughout the specification the front of of the applicants herein, and Arthur J. Mala- 10 the machine is that part closest to the operator vazos. Ihe present application relates speciliduring normal operation thereof; the back or cally to a digltation mechanism, preferably utirear is that part furthest from the operator; lizing values placed in the internal carriage deand the right or left the sides to the opscribed in the two related applications. lhe reerators right or left, respectively, as the operator lated application of Hopkins and Malavazos just faces the front of the machine. Obviously, in mentioned specifically describes and claims the views from the rear (such as in Fig. 5) the right selection mechanism for placing values in he inside will appear at the left of the figure. Also, ternal carriage and the positioning of such carlongitudinal is used as indicative of something ri pr parato y to i fl o W le the parent extending from front to back; and transverse" application, although describing the complete as extending from left to right across the mamachine and thus the features of each of the chine. related parts thereof, formed by combination of The present invention will be readily underthe mechanisms of this and the related Hopkins stood from a reference to the drawings. It can and Malavazos applications, contains only claims be here noted that the drawings herein are subdirected to the entire machine, and particularly stantially exact duplicates of Figs. 1, i, 9, 13, and to the cooperation, or interaction of parts, of- 18 to 28, inclusive, of the above-mentioned conthis and the related Hopkins and Malavazos aptinuation-in-part application Serial No. 189,8 i2. plications. Reference characters on these drawings which The primary object of the present invention is are not referred to in the present specification are to provide an improved digitation mechanism for the reference characters in such parent applicaa calculating machine. tion and the parts so indicated are described in Another important object of this invention is to such parent application and. also in the Hopkins provide a compact digitation mechanism for a and Malavazos application above-mentioned. small calculating machine, the mechanism oc- Fig-l is a front view of the adding machine copying a relatively small space and capable of of this invention. handling factors of considerable size. In one Fig. 2 is an enlarged detail of the plus and embodiment of this invention a machine of an minus keys and their associated mechanism overall width of about ten inches capable of taken from the right hand side on a vertical lonhandling factors of twenty digits. gitudinal plane running through the right hand A still further object of the present inven- 40 order of the keys. tion is to provide a novel digitation, or value Fig. 3 is a front view of the carriage shifting entering, mechanism for a calculating machine mechanism taken at a transverse plane immewhich is positive and fast in its action; which diately behind and to the left of the keyboard. does not require a prolonged cycle to complete Fig. 4. is a cross-sectional view, from the right a carry; and which is readily adaptable for use side, of the selection mechanism and the interwith a plurality of totalizers, the factor entered nal carriage, showing particularly the rolationon the single keyboard being selectively added to ship between the ca -iage of the related apph or subtracted from any one of such totalizers. tion of Hopkins and Malavazos the digitation Another object of the present invention is to mechanism herein claimed and described. p ovide a new improved method of tens-car Fig. 5 is a rear elevation of the right hand side ry which is operative during digitation without of the adding machine or" the present invention the possibilit of losing a number in the carry. showing the drive mechanism operative to cause Another object of the present invention is to digitation. provide a simplified register in which the dials, Fig. 6 is a right side view of the right hand preferably of crescent shape, can be placed in supporting plate showing the drive mechanism 3 mounted thereon such as taken on a plane indi cated by the line 66 of Figs. 1 and 5.

Fig. '7 is a left side view of the upper portion of the right side plate showing the clutch and switch mechanism taken along the longitudinal vertical plane indicated by the line '|'l of Fig. 5.

Fig. 8 is a right side view of a detail of the power control mechanism on the central supporting plate such as taken along the longitudinal vertical plane indicated by the line 8-8 in Fig. 5.

Fig. 9 is a front view of a carirage detail being taken along the vertical plane indicated by the line 99 of Fig. 4.

Fig. 10 is a right side view of a detail of the registration actuator mechanism mounted on the central supporting plate such as taken along the longitudinal plane indicated by the vertical line ifi-lfl of Fig. 5.

Fig. 11 is a right side view of the plus and minus slide mounted on the central supporting plate taken along the vertical longitudinal plane indicated by the line !i-il of Fig. 5.

Fig. 12 is a left hand view of the left side supporting plate being taken along the longitudinal vertical plane indicated by the line iZ-l 2 of Fig. 1.

Fig. 13 is a fragmentary right side elevation through the carriage and registering mechanism,

taken on a vertical longitudinal plane through GENERAL ARRANGEMENT The adding machine of the present invention is shown in Fig. l. The machine is preferably enclosed in a customary cover plate 30. In the upper left hand corner of the cover plate is a suitable rectangular aperture 3| for the display of totals accumulated in the machine, or a plurality of such apertures if a plurality of registers is desired. Below the aperture 3i is a second aperture 32 for the display of the factor then being set up in the machine, i. e., for display of check dials. Slidable decimal indicators 33 may be mounted adjacent the apertures for indicating decimal points in the check dials key 489 and the 9 numeral keys 40! to 409, in-

elusive, and the control keys are arranged in the lower right hand front face of the machine, as shown in Fig. 1. Preferably the value and control keys are mounted in a removable assembly, which is inserted through a suitable opening 33 in the lower right hand face of the cover plate.

The register dials Eli? and aperture 3!, and the check dial aperture 32 are located in the upper left hand corner of the face of the machine. The check dials 26! are carried by the internal carriage, hereinafter described, while the register dials are rotatably but non-shiftably mounted in the machine. The internal carriage lies transversely in the machine, and is located slightly below the level of the check dials, and in its home position is located to the right of the aperture 32, i. e., somewhat above the keyboard. In this position, no figures can be visible in the check dial aperture 32. The selection mechanism for transposing values selected by depression of the value keys into the internal carriage lies behind and below the keyboard. It will be understood that with the insertion of values into the internal carriage, it (the carriage) is shifted ordinally to the left, disclosing the values so inserted in the check dials, digit by digit, as they are entered.

The accumulating mechanism is located behind and below the aperture 3!, and utilizes the values inserted into the carriage for adding to or subtracting from the values standing in the accumulator. In digitation, the accumulating iechanism for each order of the register is dif ferentially operated according to the value standing in the carriage in the same order. In the example shown in Fig. 1, only the first three orders from the right will be operative to add or subtract the figure shown in the check dials, to the corresponding orders of the register. While all of the actuating levers (one for each order of the register) are driven during digitation, only the levers in the orders in which a digit is shown on the check dials are effective to cause direct operation in the register. Of course, there is a tens carry mechanism, which is operative to the left of the actuated accumulating mechanisms, and this carry mechanism is operative throughout the full width of the register.

The mechanism of the machine is mounted upon a base plate 35, which in turn is supported by the feet 34. Mounted on the base plate 35 are preferably three supporting plates, a right side plate 36 (Fig. 5), a left side plate 3"! (Fig. 12) and a center supporting plate 38 (such as is shown in Fig. 3 or 5). Other mechanisms will be supported upon the brackets mounted upon the base plate or on the three major supporting plates as will be from time to time described.

VALUE SELECTION The value selection, or the differential setting of the selection segments, is properly the invention of George W. Hopkins and Arthur J. Malavazos, as shown and described in their co-pending related application heretofore mentioned. For this reason the mechanism and its operation for the entry of such values into the settable segments of the carriage will not be described herein. It suffices, for purposes of understanding the present invention, to assrune that the values to be entered into the machine are entered by means of the value keys 400 to 499, inclusive, for operation through proper mechanism to differentially position the rotatable segments I'M disclosed in detail in Fig. 4.

The mechanism for the entry of values can briefly be summarized as follows: For the present it is suflicient to note that the carriage slides on transverse bars 143 and 144 (Fig. 13) and is provided with a rack I which is adapted to be engaged by a carriage shifting pawl I 52 (Fig. 3) to move the carriage to the left. The carriage is normally pulled to the right hand, or home, position by a strong spring I45.

As shown in Fig. 4. a sleeve surrounds the supporting shaft [43. On this sleeve H5 is ro tatably mounted a number of differentially settable selection segments I14, one for each order of the capacity of the machine. Associated with each segment i! is a setting mechanism. As the selection segments and the cooperative mechanisms are identical, only one need be described in detail.

A shaft IH extends transversely of the machine and lengthwise of the carriage, and is shown in cross-section in Fig. 4. On this shaft is mounted a number of bellcrank latches I10, one for each selection segment I14. The upper arm of each bellcrank I is provided with a latching notch I12 which normally engages an ear I13 on the selection segment. It will be noted that the lower edge of the bellcrank latch I10 is provided with a notch I76 adapted to be engaged by the noses of the selection arms 43 I 43 9. The edge of this notch is placed at an angle to the side of the bellcrank, as it is desired to have a uniform stroke of the latch Ill) irrespective of the distance from the shaft I II at which the latch is engaged. The nose [It for the zero selection lever 430 stands above the others for the purpose described in said related applications, and so requires an additional, and deeper, notch II'i whereby when it engages the bellcrank I'I'Il it will move the crank only a distance equal to that of the other arm. The lat-.h I!!! is pulled clockwise into latching position by a suitable tension spring I 92 stretched between the end of the arm Ill) and a common bracket I59 carried by the carriage.

The entry of a value into the selection arms, by causing their noses 41 to rise, disengages the latch I10 and permits the selection segment I74 to rotate counterclockwise under the influence of spring I93 (Fig. 13). The segment I'M is providecl on its lower edge with a stop I78 which engages the upwardly latched nose of the selection arm and thereby stops rotation of the selection segment. The amount of rotation of segment I74 is inversely proportional to the value of the key depressed. In the form shown eleven values are possible: a blank, the 9 to 1, inclusive, and zero. In Fig. 4 the segment stands in the blank posi tion, which is the position in which the selection segment is normally latched. The 9 value is next and represents the smallest amount of rotation of the selection segment. The value of zero is at the other extreme and represents extreme amount of rotation. For this reason the nose 41E) of the zero selection arm 439 is sufliciently high to always stop the selection segment at the zero position, if no numeral key is latched in raised position (as will happen when a multiple zero is entered into the machine).

The selection segments are held in properly spaced relationship by a comb H9 which extends longitudinally of the carriage. The upper surface of the comb also serves as a camming face to lift the right hand end of hook members 650 for the purposes hereinafter described.

The upper right hand portion of the selection segment is provided with a nose I30 adapted to engage the respective differential notches 6H oi the selection slide bill to be described hereafter. The right hand edge of the selection segment is provided with a rack E8! of eleven teeth corresponding to the blank, the 9 to 1, and zero positions (reading from top to bottom). The selection segment is normally latched by the bellcrank I'IO in the blank position, in which it is shown in Fig. 4. The carriage is moved one step to the left almost simultaneously with the setting of a value into the selection segment and as the selection segment has stopped at a differential position corresponding to the value entered, the notch IBI corresponding to such value will engage and slide upon the long detent I82 and thereafter be latched in that position. The detent I82 is pinned to a shaft I83 and is spring-pressed to engaged position by a suitable spring I84.

The selection segment is also provided with a forwardly extending arm I88 which carries a pin I89 engaging the bifurcated end of a bellcrank I90. The bellcrank I90, as shown in Fig. 13, is rotatably mounted on a shaft I9I extending across the carriage. The bellcrank is pulled clockwise by a relatively strong spring I93, one end of which is connected to the bellcrank and the other end of which to a bar I84 mounted in the carriage. A comb I 95 holds the bellcranks I90 in proper operational relationship. The upper end of the bellcrank I99 has a suitable pin and slot connection I96 with a second bellcrank I91 rockably mounted on a shaft I98. The free end of the bellcrank I91 carries a gear segment I55 which engages a gear segment 200 mounted on the register check dial 20I, which is rotatably mounted on shaft 201. Thus, the check dial registers the value set in the selection segment I'M. The check dial 2M also carries a gear segment 202 which is engaged by the nose 203 of a pawl 204 pressed into engagement with the check dial by a spring 205 tensioned between the free end of the detent 2M and a spacing bar 286 extending across the carriage.

The values diiierentially set in the selection segments I'M can be cleared by operation of the clear bail I 85, the operation of which will be described hereafter.

CARRIAGE SHIFTING As each differential value is entered into the differentially positionable segments I14 of the carriage, the carriage is shifted one order to the left from its end position. This mechanism is shown in Fig. 3. The carriage is provided with a rack I45 with which is associated a stepping pawl I50. The pawl is given a leftward stroke with each operation of the value entering mechanism, as described in said related application, to move the carriage one space to the left. The carriage is held in its adjusted position by means of the holding pawl 385.

CLEARING Provision is made for clearing the register 3I and for erasing the value set in the selection mechanism (which also erases the value set in the check dials 32) by depression of a single key 310 (Fig. 1). The depression of this key operates two separate mechanisms, one for erasing values set in the selection mechanism and the second for initiating an operation to clear values accumulated in the accumulating mechanism and shown in the register 3|. The first will now be described, while clearing of the accumulator will be described later in connection with the operation of the accumulating mechanism.

The clear key and its associated stem are essentially the same as those of the value keys. Preferahly, the key 3'!!! is mounted above and behind the zero key 3M. Depression of key 319 will rock a clear key lever 3II (Fig. 3) which is pivotally mounted on a transverse shaft, not shown here in. The forward end of the lever 3H carries a. fixed stud see (Fig. 12) which depresses the key slide 35!. This slide operates the mechanism for clearing the register and will be described hereafter in connection with operation of the digitation mechanism.

The operation of the clear key lever 3H to return the carriage to its home position and to erase the values from the selection segments IN is shown and described in detail in the related applications. It is suificient to note here that depression of the clear key, and the rocking of the clear key lever will rock an arm 25! (Fig. 3)

to release a detent (255 in the related applications) which normally locks the last operated selection arm in its raised or operative position. Rocking of the arm 251 and the releasing of the detent thereby will release the last operated selection arm, permitting it to return to its normal inoperative position. Thus, depression of the clear key will also, among other things, release any value in the selection arms.

Simultaneously with the release of the selection levers by operation of the detent not shown herein, the clearing mechanism operates to release the carriage rack M5 for return to its home, or blank, position by means of the spring 146. The mechanism for accomplishing this purpose is shown rticularlv in Fig. 3.

Adjacent the toward wall 235i of the bracket 229 (Fig. 3) the clear arm 3H is provided with a-horizontal ear 3? which underlies a two-armed lever 3'55 rockably mounted on the bracket 231, as by pin 3%].

A pin Elii on the left end, as viewed in Fig. 3, of the lever 3'55 engages a slot 3?; in vertical link 378. The link 318 is pivotally secured to an h-shaped member T8 by means of pin 338. The h-shaped member Tilt rotatably mounted on the bracket 22% by means of pin A spring 352, stretched between pin 383 on the h-shaped member and stop pin 32? mounted on the bracket, pulls the h-shaped member counter-c1ockwise Thus, the holding pawl 385 formed on the upper arm of the h-shape-cl member normally engages the rack MS of the carriage. l-l'ewever, depression of the cl key rocks the clear key lever 3H to depress the fOl-""ld end and also the rearward end thereof. Raising the rearward end of the clear key lever 3H rocks the lever 3'15 couriercloc e, which pulls the h-shaped member 379 clock 9 to disengage the pawl 385 from the rack, thereby permitting the carriage to be pulled to the right to its home position by a spring, not shown herein.

Provision is made for latching the h-shaped member in disengaging position so that the clear key may be released immediately without terminating operat on of the carriage clear mechanism. This is accomplished by means of a latch 388 which is rcclzably affixed to the bracket 23L such as by means of pin 38:3. The nose of th latch 388 is adapted to engage a pin 33? mounted on the upper arm of the h-shaped lever, whe" the h-shaped lever is rocked clockwise by de-- pression of the clear key. The latch is pulled counter-clockwise by means of spring 39% tensioned between a pin 39! on the latch and the f pivot pin 381. Thus, the h-shaped member is latched in disengaging position and the carriage can be returned to its home position by the spring even though the clear key is released.

The rack M5 is provided with an ear I47 which engages the latch 383 one space before reaching the home position of the carriage, whereby movement of the carriage to the home position pushes the latch off of the pin 32?. Thereupon the spring 382- rocks the h-shaped member counterclockwise to re-engage the pawl 38% with the rack i 25.

It is also, as part oi the clearing operation, necessary to restore the selection segments in to their blank position. operation of the clearing bail 85 (Fig. 4). The bail its is mounted on a rockable plate, not shown, rockably mounted on shaft 543 adjacent the right side of the machine, and does not shii t with the carriage. The bail itself, as shown in This is accomplished by said related application extends only over the home position of the carriage so that its operation will clear only those segments which lie to the right of the units order of the register. Such a bail is necessary in order to permit clearing of a single selection segment if that is desired.

The mechanism for initiating operation of the clearing bail 186 is shown in said related application.

Digitation Digitation in the present machine is controlled by depression of a plus or a minus key to either add or subtract the figure set in the carriage by the selecting mechanism just described. Depression of either of these keys sets the various control mechanisms and initiates digitation, and then restores the racks and carriage to their original positions. Specifically, depression. of either key sets the following controls:

(a) Engages either the plus or minus gears with the driving gear.

(17) Disengages the gear detents.

(c) Disengages all sensing arms from the step cams, thereby rotating all dials to blank position.

(d) Drops selection plate latches in those orders engaged by the carriage to enter the value set on the selection segments into the machine.

(e) Closes the main motor switch.

(j) Operates the clutch dog to engage the clutch and permit the driving motor to operate the digitation mechanism.

(9) The main motor then drives all of the actuating, or value entering, racks to positions determined by the selection mechanism in order to enter the values locked in the selection plates into the accumulator cams.

2.) During the same cycle of operation the motor operates the mechanism to disengage the gears, thereby allowing the control slides to rcturn to their neutral position. The return of the control slide to neutral position:

(1) Re-engages the detents with the gears, thereby locking them in adjusted position,

(2) Re-enables the sensing mechanism to record the values accumulated in the accumulator cams on the register dials,

(3 Conditions the selection plate latches for relatching them in operative position,

(4) Conditions the clutch for disengagement in the full cycle position, and conditions the motor switch for opening at full cycle position.

(i) The main motor then actuates a restoring bail to return the selection plates to their home (latched) position, and

(j) Simultaneously releases the carriage for return to its home position and consequent clearing of values contained therein. The same operation also restores all transfer racks to their proper position.

(It) Thereafter the drive mechanism completes its cycle, which opens the clutch, and opens the main motor switch.

The plus key 540 and the minus key 550 are shown in Fig. 1 as lying to the right of the key board. It is obvious the exact location is not critical as these keys can be placed in any convenient location. These keys are mounted upon key stems 50 (see Fig. 2). The keys are maintained in their elevated position by springs 56. A plus key slide 5-H underlies the stem of the plus key 540, and is mounted for vertical sliding movement by any suitable means, such as pin and slot connections 545, upon a bracket 5 afilxed to the base 35. The slide is maintained in its elevated position by means of a spring 546 tensioned between a pin 541 on an upstanding ear on the bracket and a pin 548 mounted on the toe of the slide. The slide carries a pin 542 adapted to engage the cam face 543 of the plus-minus slide 554 after a short movement of the key stem. The plus-minus slide 554 is mounted for substantially horizontal movement on the bracket 544 by any suitable means, such as slots 555 which encompass pins 556.

Similarly the minus key 551) is mounted on a similar key stem, which engages a minus slide 551 slidably mounted on the bracket 544. The minus slide 551 carries a pin 552 which is adapted to engage, after slight motion of the slide, the camming face 553 of plus-minus slide 554. It is obvious from the side view of the slide, shown in Fig. 2, that depression of the plus key 540 pushes the plus-minus slide 554 toward the rear while depression of the minus key pushes that slide toward the front of the machine.

The rearward end of the plus-minus slide is provided with a slot 551 which embraces a pin 561 on the plate 560. The plate 560 is pinned or otherwise rigidly secured to the transverse shaft 562. The plate 569 has a slot 563 which engages the pin 564 on the forward end of link 565. The other, or rearward end, of the link 565 (as is shown in Fig. '1) carries a pin 566 which is journalled in the slot 561 in the arm 568 pinned or otherwise rigidly secured to the shaft 569. The shaft 569 extends transversely from the right hand plate 36 to the center plate 38 (as shown in Fig.

Adjacent the center plate 38, as is shown in Fig. 8, the shaft 569 carries an arm 515 pinned or otherwise rigidly mounted thereon. The free end of the arm 515 provides a slot 516, embracing the pin 511 on the plus minus slide 518 which is slidably mounted on the center supporting plate 38. The mounting just mentioned is shown more in detail in Fig. 11 and comprises a plurality of slots 519 which encompass screws or studs 580 attached to the central supporting plate 38. The slide is normally held in its central, or inoperative, position by a pair of opposed springs 581 and 582 which are tensioned between the middle supporting stud 58D and studs 583 and 584, respectively, affixed to the slide 518.

The shaft 562, on which is mounted the rocking plate 566, extends transversely across the machine through the left hand supporting plate, as is shown in Fig. 12. An arm 596 is pinned to this end of the shaft 562, on the outside of the left supporting plate 31. This arm has a slot 592 which engages a pin 591 on the forward end of the left hand plus-minus slide 593. The second plus-minus slide 593 is also normally held in a central, or inoperative, position by a pair of opposed springs, as shown. This plate is also slidably supported on screws or studs 594 which cooperate with slots 595 in the slide.

The two plus-minus slides (518 mounted on the center supporting plate and 593 mounted on the left hand supporting plate) are, therefore,

operated in unison by the slide 554. Both plusminus slides are supported for longitudinal sliding movement on their supporting plates, and both are normally held by yieldable means in a central, inoperative position. Although these two slides derive their motion from different shafts and different arms, their component parts are so constructed and arranged that the two slides, which are quite similar in form and size are always in alignment and always move simultaneously at the same velocity.

(a) Plus or minus gear engagement The two plus-minus slides 518 and 593 are provided with identical fiat U-shaped apertures 636 having a downwardly turned notch at each end, as shown. Supported in these apertures 636 are two parallel gear shafts 151 and 158 which are maintained in spaced relationship by links 155. Referring now to Fig. 14 it will be seen that rotatably mounted on the shafts 151 and 158 are the plus gears 151 and minus gears 152, respectively, which are always in engagement with each other. It will be understood that there is a plus gear 151 and a minus gear 152, as well as a drive gear 156, for each order of the register. In their normal position the shafts 151 and 158 are in the central or raised portion of the U-shaped aperture and are disengaged from the drive gear loosely mounted on a suitable shaft 159. Thus, if the plus-minus slides 518 and 593 are moved rearwardly, the plus gear 151 will drop into engagement with the driving gear 150, as the shaft is permitted to drop into the lower depression 643 of the aperture. Conversely, if the slide is moved forwardly, the shaft 158 can drop into the upper depressions of the apertures, thereby engaging the minus gear 152 with the driving gear 156. By this means the plus or minus gearing is engaged with the driving gear upon the first motion of the plus or minus slides resulting from depression of either the plus or minus key. In this connection, it can be noted here that the dropping of either shaft 151 or 158 into the notches 643 looks the plus-minus slides 593 and 518 in an operative position. Thus digitation will continue to completion even though the operating control key 540 or 550 be released. The slides are automatically unlatchecl when the gears are positively disengaged, as hereafter explained.

(1)) Gear detents The plus and minus gearing, as shown in Fig. 14, is normally locked against rotation by means of a detent 611 mounted on the shaft 604. The detent 611 has a nose 612 adapted to engage the gear 151 and at the other end is provided with a nose 610 adapted to become engaged by movement of bail 606 as hereinafter described. The detent 61 1 is normally held in gear engaging position by the torsion spring 6 I 3.

(c) Value sensing (register) A step cam 156 is rigidly secured to the plus gear 151. This cam has 10 steps corresponding to the values 9 to 1, and zero. This cam serves as the actual accumulator and values are accumulated thereon. The register serves merely as an indicator which senses and displays the values so accumulated on the step cam 156.

The register dials 619, as shown in Fig. 14, are preferably of crescent, or arcuate, shape displaying the values zero to nine. The dials are loosely mounted on a common shaft 620. A gear segment 618 is rigidly secured to each dial. The dials are positioned by a sensing member 614 pivotally mounted on the shaft 604. The sensing member comprises a rocker arm having a nose 616 engaging the step cam 156 and at the other end a gear segment 611 engaging the gear segment 618. The sensing member is normally pulled counter-clockwise by a tension spring 615 as shown.

Referring now to Figs. 11 and 12 it will be seen that the plus-minus slides 51'8 and 593 have similar camming depressions tilt on their upper edges. Associated with each of these depressions is a pin Gill mounted on rockable plates (one associated with each slide). These plates are rotatably mounted on the shaft 694 on the side of the supporting plate opposite that of the associated slide, the pin extending through a slot 652 in the supporting plate. Each of the rockable plates 653 has an arcuate slot 68'! in which is mounted the opposite ends of a common bail 686 extending across the register mechanism. The bail 6% is yieldably held in the slots 56? by a suitable compression spring 605, as shown in Fig. 11.

Thus, the second effect of movement of the plus-minus slides 578 and 593 is to rock the rockable plate 603 clockwise (as shown in Fig. 11) to rock the bail 608 to first engage the detent 6H and disengage it from the gear 751 and immediately thereafter to rock the sensing member Bi l to return the register dial to the zero position.

((2) Release of selection plates Movement of the plus-minus slide 593 simultaneously releases the selection plates Elfl (Figs. 4, and 13) of those orders in which values have been set, thereby setting the mechanism for the differential actuation of the respective plus gears 75!. The mechanism by which this is accomplished is shown in Fig. 12. The lower edge of the plus-minus plate 593 is provided with a camming depression 638 in which sets the nose 63! or" a selection plate latch disengaging arm 832. This arm is pivotally mounted on a stud 633 riveted or otherwise affixed to the left side supporting plate 31. The free, or upper, end of the arm is provided with a pin 635 which engages a slot in the link 6225. The link B is pivotally mounted on a pin 638 carried by the selection plate latch bellcrank ($39. The link 63:": is pulled clockwise by a spring 638 tensioned between a pin 83'! on the upper end of the link and a pin 868 carried by the lever 632. The bellcrank 632i is pivotally mounted on the supporting plate 3'5, as by screw B ll"), and carries a bail 64! (which is also shown in Figs. 4 and 13). The sides of the depression 630 are sufficiently long to cam the selector plate latch disengaging arm counter-clockwise and hold it in that position so long as the plus-minus slide is held in an operative position. It is obvious that counterclockwise rotation of the arm 632 also causes counter-clockwise rotation of the bellcrank 639 and rocking of the bail 64!.

Each selection plate 610, of which there is one for each order of the register, is supported by a pair of rollers 672 engaging the race way 6'13 in the adjacent separator plates Bi (see Fig. 10). It can be noted that the various orders of the accumulator are separated by a plurality of separator plates 614 rigidly mounted in the accumulator section of the machine by any suitable means such as spacing bars 680 and 681 (see Fig. 5). The lower edge or" the selection plates G'lil is provided with a plurality of steps 6H which are adapted to be engaged by the nose I80 of the subjacent selection segment H4. The selection plate 676 is formed with an upstanding arm on which is mounted a stud 615. A strong tension spring 675 has one end secured to the stud 616 and the other to a pin 61S mounted on the separator plate 674. Thus, the plate is always under spring tension to the right, and

12 unless latched in a leftward position will move to the right to a position determined by the nose 180 of the selection segment.

The selection plate 610 also carries a fulcrum 6T8 pivotally mounted thereon, as by pin 6H. Movement of the selection plate 619 positions the fulcrum member 818 in a slot 138 of actuator lever member 13'! for the purposes hereinafter mentioned. Such position is of course determined by the engagement of one of the steps 8' with the nose I89 of the subjacent selection segment H4.

The selection plates 610 are normally held in their leftmost position by a latching member 660 pivotally mouthed on the cross shaft 562 (see Figs. 4 and 13). The latch is pulled in a counterclockwise direction about its pivot point by spring 663 tensioned between a pin 665 on the latch and a pin B54 mounted on the supporting plate. Thus the nose 665 of the latch 530 normally latches on the leftmost step of the selection plate 610 and holds it in its leftmost position. The pin 666 is also adapted to be engaged by the disengaging arm E under certain conditions.

The disengaging .arm 559 is pivotally mounted on bail 64!. The disengaging arm is normally pulled in a clockwise direction by means of spring 653 tensioned between the pin 655 on the supporting plate and a pin 656 on the arm. The nose 65l of the arm is normally pulled by the spring 553 to a position below the pin 66 on the latch member. However, as the carriage moves to the left, its spacing comb H9 cams the superposed disengaging arms 85D upwardly, whereby the hook end 65! thereof engages the pin 666 on the latch. Thereafter, when the plus or minus key is depressed, the plus or minus slide 593 operates as hereinbefore described to rock the bail 644, which in turn pulls the disengaging arm 656 to the left (as shown in Figs. 4 and 13). Such motion of the latch member disengages the latch 660 from selection plate 610, permitting the plate to be spring-pulled to the right until one or" the steps Ell thereon engages, and is stopped by, the nose I of the subjacent selection segment.

(e) M otor operation The setting of the control mechanisms above mentioned occurs during the first part of the depression of a plus or minus key. The further dedression of such key causes closing of the motor switch, thereby energizing the motor to operate the digitation mechanism. This mechanism is shown in Figs. 5, '7 and 8.

It will be recalled that depression of a plus or minus key causes a longitudinal translation of the plus-minus slides 57B and 593. The first portion of such translation is utilized to enect the setting of the control mechanism, as abovementioned. In addition to the other controls which it actuates, the slide 518, after a movement sufiicient to set the various control mechanisms, initiates closing of the motor switch and the engagement of the clutch. The lower end of the slide 518 is provided with a relatively long depression 69!) (Figs. 8 and 11), the sloping ends of which serve as camming faces to rock the twoarmed lever 69 I. This lever is pivotally mounted on the center supporting plate 38, as by pin 692. Referring to Fig. 8, it is seen that the free end of the lever 69| engages a stud 693 on an arm 694 which is pinned to the shaft 695. The shaft 695 extends from the center supporting plate to the right supporting plate (as shown in Fig. 5).

Referring now to Fig. '7, it is seen that the right hand end of the shaft 695 carries a bellcrank 596 rigidly mounted thereon. The upper end of the bellcrank carries a stud 691 riveted thereto. The stud is adapted to engage the arm 698 of a suitable switch 699. Thus, longitudinal movement of the slide 518 rocks the bellcrank 696 counterclockwise to close the switch 699, and thereby energize the motor 118.

(1) Clutch engagement The clutch 113 is engaged almost simultaneously with the energizing of the motor. The

clutch engaging mechanism is also shown in Fig. 7. A link 110 is pivotally connected to the second arm of the bellcrank 696 and to the two-armed lever, or clutch pawl, 111. This lever is rockably mounted on the supporting plate by any suitable means, such as screw 108. The bellcrank 696 and the two-armed lever 111 are normally rocked clockwise by a tension spring 109, as shown. The free end of the lever 11 1 serves as a pawl to engage the clutch dog 112 of a clutch 113 of conventional construction. The clutch mechanism need not be described as such clutches are well known in the art. It can be noted however, that normally the spring 109 pulls the clutch pawl 11 1 into a position to block the dog 112, and thereby disengage the clutch. Whenever the bellcrank 696 is rocked against the tension of the spring 109 to close the switch to the motor, it also serves to disengage the clutch pawl from the clutch dog. Such disengagement permits the spring 114 to pull the clutch dog 112 into engagement with ratchet 115 mounted on the driving shaft, thereby engaging the clutch to drive the actuator shaft 126. Preferably the clutch is provided with means for positively maintaining the clutch engaged for a full cycle and then permitting disengagement at the end of the cycle. One such means is shown, i. e., a roller 116 mounted on the pawl 11 I lies in a depression 1 I 1 in the periphery of the clutch plate. When the clutch is engaged the turning of the plate holds the pawl in disengaging position until the clutch returns to its full cycle position.

The motor drive is shown particularly in Figs. and 6. The motor 118 is connected by means of a slip clutch 119, or other drive connection, to the horizontal shaft 120. The gear 121 mounted on the outer end of the shaft engages a gear 122 on the vertical shaft 123. The shaft 123 is sultably 'ournalled in brackets 121, as shown. A worm 124 mounted on the shaft 123 engages a gear 125 which is keyed to the driving ratchet 115 of the clutch (see Fig. 6). A horizontal shaft 125 connects the driven side of the clutch 112 with the actuating mechanism to be described hereafter.

(g) Digitation which extends across the machine between the left hand and the center plates, the bail operating through arcuate slots 136 in the separating plates 614. It is obvious with each revolution of 14 the shaft 126, the bail will be rocked downwardly through a path of constant length and then rocked back to its starting position. The complementary cams are so designed to provide a dwell at the end of the clown stroke in order to provide a period sufficiently long to disengage the register gearing before starting the return stroke. Thus, the down stroke can be utilized for the entry of values into the register, after which the gears are disengaged and the return stroke of the bail 135 has no effect upon the registering mechanism.

A plurality of slotted levers 131 (one for each order of the register) are pivotally mounted on the bail 135. A slot 138 of this lever engages the fulcrum 618 mounted on the associated selection plate 610. It will be recalled that the selection plates, when the latches 650 are released in the early part of the operation of the plus-minus slides, are pulled to the right by the springs 615 until the plates are stopped by the noses of the corresponding selection segments 114. Such movement of the plates 611] positions the ful crums 618 in positions corresponding to the value to be entered. The adjustment of each fulcrum 618 causes a differential reciprocation of the free end of the associated lever 131 from the constant rocking of bail 135. This differential reciprocation is utilized to impart a differential rotation to the associated driving gear 150. To accomplish this purpose the free end of the lever 131 is provided with a slot 139 which engages a roller 141 on a slide 140. It will be understood that there is a slide for each order of the register.

It will be seen by referring to Fig. 13 that each slide is mounted for longitudinal reciprocation on a separator plate 614 by means of slots 142 engaging pins 143 attached to the separator plate. Slidably mounted on each slide, is a rack 144. Only one such rack is shown in Fig. 13, but it is obvious that if a plurality of registers were desired it would be quite simple to mount a similar number of racks 144 on the slide 140, in which event each rack would be moved by the slide. The rack is mounted on a pair of broad headed pins 146 which are engaged by slots 145 in the rack (see also Fig. 14). These slots are relatively short, being only long enough to permit the rack to move one unit space relative to the slide. The racks are spring-urged to the right by means of a spring 141 tensioned between the rack 144 and the slide 140 as shown. The racks 144, however, are normally locked against movement relative to the slide 140 by means of a notch 146 engaging the tens carry detent, or latch, 321. As shown in Fig. 14, the gear 150 is constantly in engagement with the rack 144, so that differential reciprocation of the slide and rack imparts a differential oscillation to the gear 150 about its supporting shaft 159. It will be recalled that prior to energizing the motor 118, the plus gear 151 or the minus gear 152 are dropped into engagement with the driving gear 150. Thus, the down stroke of the bail 135 results in differential rotation of the gear 150 with the consequent entry by such rotation, additively or subtractively depending upon which gear is in engagement therewith, into the accumulator cam 156. While the slide and rack are returned to their normal position by the return stroke of the bail 135, with consequent counter-rotation of gear 850, such return does not affect the accumulator gears 151 or 152 as they will have been disengaged from gear 150 before such return stroke begins. 

